要了解某一生态环境中生物的种类和数量，通常采用的方法是（）A．调查法B．实验法C．观察法D．解剖法-生物

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• 你们班近视的同学多吗？调查一下本班同学的近视率（近视的人数占全班人数的百分比），跟同学一起分析患近视的原因，讨论保护视力的措施．讨论：（1）学生患近视的原因主要包括哪些？-生物
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